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Ch 9 Volcanic Sections 2 & 3

Across
Cinder cones are small. Most of them erupt for only a short time. For example, Paricutín is a cinder cone volcano in ________. (158)
_______ volcanoes are currently erupting or show signs of erupting in the near future. (165)
Volcanoes produce many unique _________, or surface features. (157)
In 1991, an explosive eruption on Mount ________ caused global temperatures to drop. (157)
Melted (161)
is the temperature at which the rock melts for a certain pressure. (161)
a large, circular depression that forms when the magma chamber below a volcano partially empties and causes the ground above to sink (vocab)
an area of deep cracks that forms between two tectonic plates that are pulling away from each other (vocab)
At a ________ boundary, the tectonic plates collide. (163)
Measured from the base on the ocean floor, _______ _____ is taller than Mount Everest!(158)
________ volcanoes are currently not erupting, but they may erupt again. (165)
Down
Most scientists think that hot spots form above hot columns of mantle rock called mantle _______. (164)
a bowl-shaped depression that forms on the surface of an object when a falling body strikes the object’s surface or when an explosion occurs (vocab)
_______ volcanoes form when layers of lava from many nonexplosive eruptions build up. (158)
When an oceanic plate collides with a continental plate, the oceanic plate slides under the continental plate. This is called _________. (163)
Scientists can use an instrument called a ________ to measure the slope of the volcano’s sides. (165)
a wide, fl at landform that results from repeated nonexplosive eruptions of lava that spread over a large area (vocab)
__________ volcanoes are the most common type of volcano. (159)
_______ _______ volcanoes are made of pyroclastic material. The pyroclastic material is produced from explosive eruptions. (158)
a volcanically active area of Earth’s surface, commonly far from a tectonic plate boundary (vocab)
________ volcanoes have not erupted in recorded history and probably will not erupt again. (165)
At a __________ boundary, tectonic plates move away from each other. (162)